Chuck for refinishing staff-pivots.



No. 760,314. PATENTBD MAY 1'7, 1904. G. GULMAN.

GHUGK FOR REFINISHING STAFF PIVOTS.

APPLIOATIOH FILED NOV.5, 1903. N0 MODEL.

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UNITED STATES Patented May 17, 1904.

PATENT OFFICE.

CARL CULMAN, OF ST. LOUIS, MISSOURI.

CHUCK FOP! REFINISIHING STAFF -PIVOTS- SPECIFICATION forming part ofLetters Patent No. 760,314, dated May 17, 1904.

Application filed November 5, 1903. Serial No. 179,947. (No model.)

To all whom it may concern:

Be it known that I, CARL OULMAN, a citizen of the United States,residing at St. Louis, State of Missouri, have invented certain new anduseful Improvements in Chucks for Refinishing Staff-Pivots, of which thefollowing is a specification containing a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart hereof.

My invention relates to improvements in chucks for refinishingstaff-pivots; and it con sists of the novel construction, combination,and arrangement of parts hereinafter shown, described, and claimed.

In the drawings, Figure 1 is a side elevation of my in vcntion withparts broken away. Fig. 2 is a top plan view of the same. Fig. 3 is anend view of my invention looking toward the right-hand end of Fig. 2.Fig. 4 is a section taken on thelinc 4 4 of Fig. 2.

The object of my invention is to construct a chuck especially designedas a watch-1e pairers tool for holding the balance-wheel complete withhair-spring and roller in position while refinishing and repolishingstalipivots which have become rough or Worn.

By the use of my invention a great deal of time may be saved bywatchmakers and better results obtained than by the old method, where itis necessary to dismount the hairspring and roller and often the stallin order to repolish the pivots.

Referring to the drawings, 1 indicates the shank, provided with theintegral screwthreaded portion 2, which is adapted to be in; sorted intothe chuck of the watchmakers lathes now in use. Formed integral with theshank 1 is a circular disk 3, and formed integral with said circulardisk 3 is a semicircular rim 4, and formed integral with saidsemicircular rim 4 is an annular ring 5, and formed on the exterior ofsaid annular ring 5 is a resilient head, diaphragm, or disk 6. Thedesignated parts 3, 4, 5, and 6 constitute the head portion of theinstrument or chuck, and when formed integral. as heretofore stated, aspace 7 is formed, in which may be located and removed whenever desiredthe balance-wheel 8 and its accompanying parts, hair-spring, &c.

Formed in the circular disk 3 is a screwthrcaded hole 9, and located insaid hole is a screw-threadcd thumb-screw 10,providcd with a tapered end11. Formed in the disk or diaphragm 6 is a small hole or perforation 12,in which the stafl pivot 13 of the balance-wheel 8 is adapted to snuglyfit, and when so located therein it projects beyond the face of thedisk, as illustrated in Figs. 1 and 2.

The shank 1 is provided with a longitudinal bore, in which is locatedthe pin 14. The pin 14 is provided with a longitudinal V- shaped groove15, in which the tapered end 11 of the thumb-screw 10 is adapted tosnugly lit. By means of the thumb-screw 10 the pin 14 may be adj ustcdas desired, and by means of the tapered end 11, the thumb-screw 10, andthe longitudinal V-shaped groove 15 said pin 14 is prevented fromturning. The pin 14 is provided with a hole 16, in which is adapted tobe inserted the staff-pivot of the balance-wheel. The resiliency of thedisk or diaphragm 6 tends to prevent the staff and the staif-pivots fromturning when they are located in the holes 16 and 12.

The operation is as follows: When it is desired to polish thestaff-pivots, the pin 14 is properly adjusted, and the stalf-pivot 13 islocated in the hole 12 of the disk 6, and the other end of thestaff-pivot is located in the hole 16 of the pin 14, and then the pin 14is properly adjusted. The instrument is then attached to the lathe asheretofore described,

and by applying the proper tool to the stail staiT-pivots, comprising ashank adapted to be attached to the lathe and a head provided with acircular opening adapted to receive the balance-wheel carried by saidshank, an adjustable pin located in said shank and projecting in saidopening for supporting one end of the IOC staff-pivot, and a small holein the head in alinement with said pin for supporting the other end ofthe stafi-pivot, substantially as specified.

2. A chuck for polishing and refinishing staff-pivots, comprising ashank adapted to be attached to the lathe, and a head comprising acircular disk and a resilient disk spaced apart so as to form anopeningadapted to receive the balance-Wheel and its accompanying parts, thesaid resilient disk being provided with an opening to receive one end ofstaffpivot, and the said shank carrying an adjustable pin adapted toreceive the other end of the staff-pivot, substantially as specified.

3. A chuck for polishing and refinishing staff-pivots, comprising ashank adapted to be scribing Witnesses.

CARL CULMAN. Witnesses:

ALFRED A. EICKS, M. IRIoN.

